Rigid coupler



FIG. 1 is a perspective view of the rigid coupler showing the design;

FIG. 2 is a front view of the rigid coupler showing the design;

FIG. 3 is a rear view of the rigid coupler showing the design;

FIG. 4 is a left view of the rigid coupler showing the design;

FIG. 5 is a right view of the rigid coupler showing the design;

FIG. 6 is a top view of the rigid coupler showing the design; and,

FIG. 7 is a bottom view view of the rigid coupler showing the design. 

CLAIM The ornamental design for a rigid coupler, as shown and described. 